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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2023	Oct. 02, 2022	Oct. 01, 2023	Oct. 02, 2022
Revenue from Services
Segment revenue from services	$ 1,118.0	$ 1,167.9	$ 3,603.5	$ 3,731.6
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(5.0)	(0.3)	(15.1)	(0.9)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	364.5	408.6	1,131.3	1,268.7
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	295.7	321.3	903.5	962.7
Education | Reporting Segments
Revenue from Services
Segment revenue from services	128.1	104.3	583.9	433.2
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	114.1	118.5	342.4	352.0
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 220.6	$ 215.5	$ 657.5	$ 715.9

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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